[brian eiland]

I'm not sure of the reference as I stated, but I found these

http://www.gisp2.sr.unh.edu/MoreInfo...ores_Past.html

http://en.wikipedia.org/wiki/Ice_core

http://nicl.usgs.gov/

http://www.pbs.org/wgbh/nova/warnings/stories/

http://www.pbs.org/wgbh/nova/warnings/stories/nojs.html

http://www.sciencedaily.com/releases...0123110405.htm